Brake-shoe.



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JOHN C. CORDREY AND PATRICK J. BRADY, OF HARVEY, ILLINGIS.

BRAKE-'SHOE- Specification of Letters Patent.

Patented May 22, 1906.

T0 all whom it may concern,.-

Be it known that we, JOHN C. CORDREY and PATRICK J. BRADY, citizens of the United States of America, residing at Harvey, in the county of Cook and State of Illinois, have invented new and useful Improvements in Brake-Shoes, of which the following is a specification.

This invention relates to brake-shoes, the

primary object of the invention beingto provide a brake-shoe of exceptionally good wearing qualities and one which will combine the maximum strength with durability and effective frictional qualities.

vWith the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination, and arrangement of parts, as hereinafter fully described, illustrated, and claimed.

In the accompanying drawings, Figure 1 is a side elevation of a brake-shoe embodying the present invention. Fig. 2 is a rear elevation of the same. Fig. 3 is a face view of the brake-shoe. Fig. 4 is a cross-section through the same. Fig. 5 is a central longitudinal section through the brake-shoe. Fig. 6 is a detail section through one end of the shoe, showing the manner in which the truss-rods are combined therewith.

Like reference-numerals designate corresponding parts in all figures of the drawin s.

The body l of the brake-shoe is of the amiliar and general form, and in carrying out the present invention the said body 1 is cast and'composed of soft tough cast-iron, thus providing the greatest strength and also imparting good frictional qualities to the bearing-surface of the shoe. v

Extending longitudinally along the back of the shoe are parallel webs or ribs 2, the outer edges of which are formed with semicylindrical seats or gutters, in which are received parallel truss-rods 3. These trussrods are preferably of wrought-iron, and in the process of casting the body of the shoe the extremities of the truss-rods are embedded in said body, as shown in Fig. 6, far enough to prevent any possibility of the escape of said rods. In fact, the rods are placed in the mold, and the body of the shoe, including the webs or ribs 2, is molded around or against the truss-rods, thus forming a uniform and even seat for the truss-rods throughout their entire length. In the molding process the body of the shoe is also provided with the usual eye 4 and bearing-shoulders 5 for the connections of the brake mechanism.

The Working face 6 of the shoe is cast with a pocket or recess 7, having the lateral dovetailed extensions 8, the said pocket as a whole extending to a depth of about one inch into the working face of the shoe and throughout. the greater part of the length thereof. At one end the shoe is provided with a pouring-hole 9, and after said body has been cast and allowed to cool a mixture of metal is poured through the hole 9 until the recess or pocket '7 is completely filled out to the surface of the shoe. Preparatory to filling the pocket 7 a face-plate (not shown) conforming closely to the surface 6 of the shoe is secured against the shoe, so as to close the pocket 7, and the molten metal poured into said pocket becomes chilled against said face-plate and also against the Walls and bottom of the pocket. This forms the effective Wearing-surface of the brakeshoe, and by applying the filling in the manner described a very hard wearing-surface is produced, which, however, is so regulated as to be softer than the tread of the wheel to which the brake-shoe is applied, thus avoiding liability of the shoe to out and injure the wheel. By the process described the chilling of the main body of the shoe is also avoided, and the tough and frictional qualities of the body are not im aired, as is the case where the body of the s ioe is cast around a chilled or hard-metal insert.

Having thus described the invention, what We claim is 1. A brake-shoe comprising a body having parallel webs or ribs along the back thereof, and truss-rods seated along the edges of said ribs and having their extremities inserted in the body of the shoe.

2. A brake-shoe provided with ribs or webs extending along its back and having their edOes concaved to provide gutters, and trussro s extending lengthwise of the ribs and seated in said gutters and having their ends connected fast to the body of the shoe.

3. A brake-shoe provided with a pocket extending lengthwise of the center of its working face and having a plurality of extensions leading off laterally from opposite sides there- IOO IOS

of, and a pouring-hole located centrally of In testimony Whereol We affix our signaone end o the shoe in line with the main tures in presence of two Witnesses.

body portion of said pocket, and a chilled JOHN C. CCRDREY.

filling for said pocket introduced in the form PATRICK J. BRADY. 5 of molten metal and' chilled by Contact With Witnesses:

the body of the shoe, substantially as de- FRANK E. SHUR,

scribed. LOREN A. CAMPBELL 

